[dpdk-dev] [PATCH] buildtools: Check GCC version to avoid GCC 6.3.0 avx512 bug

Stephen Hemminger stephen at networkplumber.org
Sat Jul 17 19:48:49 CEST 2021


On Sat, 17 Jul 2021 18:08:30 +0100
Liang Ma <liangma at liangbit.com> wrote:

> From: Liang Ma <liangma at bytedance.com>
> 
> GCC 6.3.0 has a known bug which related to _mm512_extracti64x4_epi64.
> Please reference https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82887
> 
> Some DPDK PMD avx512 version heavily use _mm512_extracti64x4_epi6,
> which casue building failure with debug buildtype.
> 
> Therefore, it's helpful to disable avx512 for GCC 6.3.0
> 
> Bugzilla ID: 717
> Fixes: e6a6a138919f (net/i40e: add AVX512 vector path)
> Fixes: 808a17b3c1e6 (net/ice: add Rx AVX512 offload path)
> Fixes: 4b64ccb328c9 (net/iavf: fix VLAN extraction in AVX512 path)
> Cc: stable at dpdk.org
> 
> Reported-by: Liang Ma <liangma at liangbit.com>
> Signed-off-by: Liang Ma <liangma at bytedance.com>

What distro still has GCC 6.3.0?


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